Caisson structures for underground soil blocking and manufacturing method of anti-noise non-vibration caisson structures using thereof

ABSTRACT

As described above, the caisson structure according to the present invention is robotized to be moved up and down by itself, and thus there is no need of using large-size constructive machines such as cranes that are used in the existing construction methods, and has an effect of improving capability of structures for underground soil blocking against a lateral force since connections and engagement among inter-lateral-side iron rods or reinforced iron members are continuously integrated all over the four surfaces, which has been weak in a bored piling construction method and a continuous wall construction method such as an SCW (Soil Cement Wall) construction method or CIP (Cast-In Placed Pile) construction method, and this significantly reduces usage of internal reinforcement materials for supporting beams, thus saving costs of construction. Also, the strength and stability of a structure against the lateral force of the inter-lateral-sides, thus leading to a significant lowering in safety accidents such as collapse or upset of temporary structures for soil blocking.

TECHNICAL FIELD

The present invention relates to a caisson structure for underground soil blocking and a construction method using the caisson structure that may minimize the occurrence of noise, vibration, and dust at regions sensitive to vibration or noise such as soft-ground regions or ultra soft-ground regions, cultural properties protection zones sensitive to vibration, and densely-populated districts in a city such as apartment complexes to allow for swift construction.

Also, the present invention relates to a caisson structure for under soil blocking and a noiseless, vibration-free construction method using the caisson structure that reduces the number of processes, time, and costs required for construction and significantly decreases the dangerousness such as safety accidents at a construction site, as well as facilitates to install the caisson structure by integrally forming a hydraulic cylinder and a control unit to the caisson to be constructed on the ground which provides a fresh working environment and robotizing the caisson structure to be operated by its own driving operation.

BACKGROUND ART

In general, working processes are performed, such as temporary soil blocking of building basement, installing of underground box or underground water tank, and installing of other underground structures, as well as well foundation construction method, underground foundation structure installing, and river bridge foundation plate installing at a soft ground site for construction of a building or structure at a construction site such as on the ground, underground, and underwater.

In particular, a bored piling construction method and a continuous wall construction method are used for a SCW (Soil Cement Wall) construction method and a CIP (Cast-In Placed Pile) construction method in a temporary soil blocking structure constructed to prevent the soil from collapsing during a digging process at a construction site.

However, these construction methods have several problems of being done by large-size heavy equipments, causing construction noise and vibration, and high construction costs, as well as generating industrial wastes, such as sludge, in the course of construction.

In a mixing process using an existing multi-axial auger, the construction quality was not constant—for example, the strength of the continuous walls that are mixed and cured under the ground was not constant or lower than a designed strength depending on the type and state of the soil, lowering in concentration of the cement milk liquid due to inflow of underwater, skill of workers, working speed, etc. And, it was impossible to confirm the quality of the construction before digging and highly dependent on the usage of iron subsidiary materials such as H-beams, which caused the rental fee and transport charges to be given a great deal of weight among the construction expenses.

DISCLOSURE Technical Problem

The present invention has been designed to solve the above problems, and an object of the present invention is to swiftly construct a caisson structure for underground soil blocking by minimizing the occurrence of noise, vibration, and dust at regions sensitive to vibration or noise such as soft-ground regions or ultra soft-ground regions, cultural properties protection zones sensitive to vibration, and densely-populated districts in a city such as apartment complexes.

And, another object of the present invention is to reduce the number of processes, time, and costs required for construction and significantly decreases the dangerousness such as safety accidents at a construction site, as well as to facilitate to install the caisson structure by integrally forming a hydraulic cylinder and a control unit to the caisson to be constructed on the ground which provides a comfortable working environment and robotizing the caisson structure to be operated by its own driving operation.

Further, still another object of the present invention is to provide a caisson structure for underground soil blocking and a noiseless, vibration-free construction method using the caisson structure that raise the construction quality because of maintaining the strength of construction continuous walls constant without respect to types and state of soil, lowering in concentration of the cement milk liquid due to inflow of underground water, and skill of the workers.

Technical Solution

To achieve the above objects, a caisson structure for underground soil blocking according to the present invention includes a stereoscopic upper caisson body 10 separately manufactured on the ground for underground soil blocking; plural hydraulic cylinders 20 provided at the lower part of the upper caisson body 10; a lower propulsion caisson 30 to the upper side of which the cylinder road of the hydraulic cylinder 20 is combined to move up and down by a drive of the hydraulic cylinder 20; a tensioner 40 attached on the upper side of the upper caisson body 10 to tension an earth anchor 60 deposited in an underground rock layer with the maximum tension by a steel wire 70; and a controller 50 installed at the upper caisson body 10 to control the hydraulic cylinder 20 and the tensioner 40, wherein while the lower propulsion caisson 30 compresses the ground by the hydraulic cylinder 20, the ground is sunken and simultaneously the tensioner 40 draws the steel wire 70, so that the upper caisson body 10 and the lower propulsion caisson 30 are lowered up to a targeted point.

Meanwhile, a noiseless, vibration-free construction method using an underground caisson structure for underground soil blocking according to the present invention includes an earth anchor fixing step of vertically perforating the ground on which the caisson is located up to a rock supporting layer by using an earth anchor perforator and then inserting the earth anchor 60 to which the steel wire 70 is coupled into the perforated ground to fix the earth anchor 60 to the underground rock layer; a caisson manufacturing step of manufacturing the upper caisson body 10 and the lower propulsion caisson 30 separately from each other and then combining the upper caisson body 10 and the lower propulsion caisson 30 to each other through the hydraulic cylinder 20 to produce a robotized caisson structure; a structure lowering step of allowing the upper caisson body 10 and the lower propulsion caisson 30 to arrive at a targeted point, with the lower propulsion caisson 30 moving up and down by the hydraulic cylinder 20 to collapse the soil after the steel wire 70 is coupled with the tensioner 40 provided in the upper caisson body 10; after the structure lowering step, an integration step of dismantling the tensioner 40 provided in the upper caisson body 10 and the hydraulic cylinder 20 connecting the upper caisson body 10 with the lower propulsion caisson 30 after the completion of internal digging of the caisson structure and integrating the upper caisson body 10 and the lower propulsion caisson 30 by welding; and after the integration step, a finishing step of filling the lower part of the caisson structure with concrete and then curing the concrete.

Advantageous Effects

As described above, the caisson structure according to the present invention is robotized to move up and down by itself, and thus there is no need of using large-size constructive machines such as cranes that are used in the existing construction methods, and has an effect of improving capability of structures for underground soil blocking against a lateral force since connections and engagement among inter-lateral-side iron rods or reinforced iron members are continuously integrated all over the four surfaces, which has been weak in a bored piling construction method and a continuous wall construction method such as an SCW (Soil Cement Wall) construction method or CIP (Cast-In Placed Pile) construction method, and this significantly reduces usage of internal reinforcement materials for supporting beams, thus saving costs of construction. Also, the strength and stability of a structure against the lateral force of the inter-lateral-sides are improved, thus leading to a significant lowering in safety accidents such as collapse or upset of temporary structures for soil blocking.

And, the construction is performed by the self weight of the caisson structure and push-in force of the hydraulic cylinder and thus no noise, no vibration, and no dust are generated during construction. Therefore, the present invention is very advantageous for densely-populated districts in a city sensitive to noise and vibration or sites likely to become a target of public grievance. The present invention also creates no second pollutant such as industrial wastes.

DESCRIPTION OF DRAWINGS

FIG. 1 is a view schematically illustrating a state of a caisson structure for underground soil blocking according to an exemplary embodiment of the present invention;

FIG. 2 is a view illustrating a state where the lower propulsion caisson of the present invention compresses the ground by a hydraulic cylinder to be shifted.

FIG. 3 is a view illustrating a state where the upper caisson body is lowered by the tensioner, with the lower propulsion caisson of the present invention lowered.

FIG. 4 is a view illustrating a state where the lower propulsion caisson of the present invention recompresses the ground to be shifted, with the upper caisson body lowered.

FIG. 5 is a block diagram illustrating a controller of a caisson structure for underground soil blocking according to the present invention.

FIG. 6 is a flowchart illustrating a noiseless, vibration-free construction method using a caisson structure for underground soil blocking according to the present invention.

FIG. 7 is a view illustrating another state of the lower propulsion caisson and the upper caisson body of a caisson structure for underground soil blocking according to the present invention.

FIG. 8 is a view illustrating still another state of the lower propulsion caisson and the upper caisson body of a caisson structure for underground soil blocking according to the present invention.

BEST MODE

Hereinafter, an exemplary caisson structure for underground soil blocking will be described in detail with reference to accompanying drawings.

FIG. 1 is a view schematically illustrating a state of a caisson structure for underground soil blocking according to an exemplary embodiment of the present invention, FIG. 2 is a view illustrating a state where the lower propulsion caisson of the present invention compresses the ground by a hydraulic cylinder to be shifted, FIG. 3 is a view illustrating a state where the upper caisson body is lowered by the tensioner, with the lower propulsion caisson of the present invention lowered, FIG. 4 is a view illustrating a state where the lower propulsion caisson of the present invention recompresses the ground to be shifted, with the upper caisson body lowered, FIG. 5 is a block diagram illustrating a controller of a caisson structure for underground soil blocking according to the present invention, FIG. 6 is a flowchart illustrating a noiseless, vibration-free construction method using a caisson structure for underground soil blocking according to the present invention, FIG. 7 is a view illustrating another state of the lower propulsion caisson and the upper caisson body of a caisson structure for underground soil blocking according to the present invention, and FIG. 8 is a view illustrating still another state of the lower propulsion caisson and the upper caisson body of a caisson structure for underground soil blocking according to the present invention.

Referring to FIGS. 1 to 8, the caisson structure for underground soil blocking according to the present invention includes a stereoscopic upper caisson body 10 separately manufactured on the ground for underground soil blocking; plural hydraulic cylinders 20 provided at the lower part of the upper caisson body 10; a lower propulsion caisson 30 to the upper side of which the cylinder road of the hydraulic cylinder 20 is combined to move up and down by a drive of the hydraulic cylinder 20; a tensioner 40 attached on the upper side of the upper caisson body 10 to tension an earth anchor 60 deposited in an underground rock layer with the maximum tension by a steel wire 70; and a controller 50 installed at the upper caisson body 10 to control the hydraulic cylinder 20 and the tensioner 40. The caisson structure is designed so that while the lower propulsion caisson 30 compresses the ground by the hydraulic cylinder 20, the ground is sunken and simultaneously the tensioner 40 draws the steel wire 70, so that the upper caisson body 10 and the lower propulsion caisson 30 are lowered up to a targeted point.

Further, a noiseless, vibration-free construction method using the underground caisson structure for underground soil blocking according to the present invention includes an earth anchor fixing step of vertically perforating the ground on which the caisson is located up to a rock supporting layer by using an earth anchor perforator and then inserting the earth anchor 60 to which the steel wire 70 is coupled into the perforated ground to fix the earth anchor 60 to the underground rock layer; a hole formation step of forming plural holes that reach the construction depth of a place where the caisson structure is to be located by using an auger in order to reduce bearing force of soil and frictional resistance; a caisson manufacturing step of manufacturing the upper caisson body 10 and the lower propulsion caisson 30 separately from each other and then combining the upper caisson body 10 and the lower propulsion caisson 30 to each other through the hydraulic cylinder 20 to produce a robotized caisson structure; a structure lowering step of allowing the upper caisson body 10 and the lower propulsion caisson 30 to arrive at a targeted point, with the lower propulsion caisson 30 moving up and down by the hydraulic cylinder 20 to collapse the soil after the steel wire 70 is coupled with the tensioner 40 provided in the upper caisson body 10; after the step, an integration step of dismantling the tensioner 40 provided in the upper caisson body 10 and the hydraulic cylinder 20 connecting the upper caisson body 10 with the lower propulsion caisson 30 after the completion of internal digging of the caisson structure and integrating the upper caisson body 10 and the lower propulsion caisson 30 by welding; and after the step, a finishing step of filling the lower part with concrete and then curing the concrete.

The upper caisson body 10 and the lower propulsion caisson 30 are produced by performing a dual bar arrangement of iron bars and steel wires inside high-tenacity SFRC (Steel Fiber Reinforced Concrete) or high-tenacity FRC (Fiber Reinforced Concrete) not to cause any deformation and cracks. An H-beam structure is arranged at a joint where the upper caisson body 10 and the lower propulsion caisson 30 are coupled to each other, and the hydraulic cylinder 20 is installed at the H-beam structure so that the upper caisson body 10 and the lower propulsion caisson 30 are integrally coupled with each other.

That is, an installation bracket which is provided at one side of the hydraulic cylinder 20 is arranged at an H-beam structure provided at the lower side of the upper caisson body 10, and then another installation bracket which is provided at the other end of the hydraulic cylinder 20 is connected to an H-beam structure provided at the upper side of the lower propulsion caisson 30, so that the upper caisson body 10 and the lower propulsion caisson 30 are integrally coupled with each other via the hydraulic cylinder 20.

Here, it is preferable that a lower part of the lower propulsion caisson 30 is formed to be narrow as going from an outer surface to an inner surface, so that the lower propulsion caisson 30 may be subjected to easier downward propulsion without being damaged by rocks or gravel upon downward propulsion.

The usage of the above materials and the above manufacturing method provide effects of increasing the tensile strength and flexural strength of the caisson structure, preventing any cracks, and increasing resistance, shear strength, and fatigue strength against shocks to reduce the thickness of the caisson wall member.

In this condition, the tensioner 40 is provided at an upper side of the upper caisson body 10, and the earth anchor 60 installed in the underground rock layer is connected to the tensioner 40 through the steel wire 70, which in turn tensions the steel wire 70 with the maximum tensioning force.

At this time, it is preferred that plural holes have been previously bored from the ground up to targeted points of the caisson structure.

That is, if the lower propulsion caisson 30 compresses the ground by the operation of the hydraulic cylinder 20 controlled by the controller 50, soil collapses into the bored holes and the lower propulsion caisson 30 moves down by the collapsed depth, and then when a space is secured near the joint of the upper caisson body 10 and the lower propulsion caisson 30 by the stroke length of the cylinder rod, the tensioner 40 operated by the controller 50 pulls the steel wire 70 and the hydraulic cylinder 20 is contracted so that they perform an organic interaction to move the upper caisson body 10 downward.

The process is to minimize bearing force of soil which is transferred from the ground and superficial frictional resistance of the structure.

The repetitive operation allows the upper caisson body 10 and the lower propulsion caisson 30 to arrive at the targeted point.

If the upper caisson body 10 and the lower propulsion caisson 30 reach the targeted point, internal digging for the caisson structure starts to be performed, and after completion, the hydraulic cylinder 20 connecting the upper caisson body 10 and the lower propulsion caisson 30 is removed and then integrated to each other by welding.

As such, the present invention enables the caisson structure that is divided into the upper caisson body 10 and the lower propulsion caisson 30 to be fluidized by the hydraulic cylinder, and therefore, may improve working environments thanks to minimization of creation of noises, vibration, and dust, swiftly complete a construction, maintain the strength of continuous walls for construction constant without respect to types and state of soil, lowering in concentration of cement milk liquid due to inflow of underground water, or skill of workers, and reduce construction expenses upon construction, particularly on the sea, or at a waterside area or soft ground, because of being directly manufactured on the water to be capable of carrying out a one-point construction up to an underwater rock layer without any need of constructive machines such as large-size cranes or movable large-size barges.

Hereinafter, a noiseless, vibration-free construction method using the underground caisson structure for underground soil blocking according to the present invention will be described in more detail.

First, vertical perforation is performed up to an underground rock layer by the earth anchor perforator and then the earth anchor 60 to which the steel wire 70 is connected is fixed to the underground rock layer.

This plays a role to prevent the caisson structure from being lifted, i.e. floating phenomenon, upon exertion of a push-in force during construction.

Thereafter, plural holes are bored by an auger, which reach the construction depth of a location where the caisson structure is to be located.

In this case, it is preferred to form the plural holes every other hole so that the collapsed soil is filled in the holes bored when the caisson structure moves down without causing any disturbance of the original ground, thus removing any necessity of separately removing the soil.

If the hole perforation is complete, the perforated ground is filled and the caisson structure is divided into the upper caisson body 10 and the lower propulsion caisson 30 and then coupled to each other via the hydraulic cylinder 20 to produce a robotized caisson structure, wherein according to an aspect of an in-situ application of the caisson structure, for example, in case of constructing an underground room, a box for the underground room is firstly produced on the ground and in case of a well foundation construction method, a well foundation is firstly produced on the ground.

Then, the steel wire 70 is connected to the tensioner 40 at which the upper caisson body 10 is installed, and then the upper caisson body 10 and the lower propulsion caisson 30 reach the targeted point with the lower propulsion caisson 30 moving up and down by the hydraulic cylinder 20 to collapse the soil.

At this time, a floating phenomenon that the upper caisson body 10 is lifted takes place while the upper caisson body 10 and the lower propulsion caisson 30 move downward due to remaining bearing force of soil and frictional resistance of inner and outer walls. As a step taken against this, the steel wire 70 connected to the earth anchor 60 supported by the rock layer tensions the steel wire 70 through the tensioner 40 provided at the upper caisson body 10 so that the upper caisson body 10 is not lifted upon propulsion of the hydraulic cylinder 20.

If the caisson structure is seated at the targeted point through the repetitive operation of propulsion and falling, the tensioner 40 at which the upper caisson body 10 is provided and the hydraulic cylinder 20 connecting the upper caisson body 10 and the lower propulsion caisson 30 are dismantled and then the upper caisson body 10 and the lower propulsion caisson 30 are integrated by welding.

After the integration of the upper caisson body 10 and the lower propulsion caisson 30 by welding, concrete is filled at the lower part and cured.

Here, the steel wire 70 separated from the tensioner 40 integrates the bottom concrete with the bottom iron bars, and this provides an effect of preventing a heaving phenomenon occurring at a soft ground and a floating phenomenon of a construction structure caused by a buoyant force from hydraulic pressure.

As such, the present invention may provide a construction method that is very effective for regions sensitive to vibration or noise such as soft-ground regions or ultra soft-ground regions, cultural properties protection zones sensitive to vibration, and densely-populated districts in a city such as apartment complexes since the caisson structure is installed without causing any noise, vibration, or dust up to a targeted point while the lower propulsion caisson moves downward by a stroke length of the hydraulic cylinder as well as provides rapidity, economical efficiency, and stability of being capable of raising the construction quality because of maintaining the strength of construction continuous walls constant without respect to types and state of soil, lowering in concentration of the cement milk liquid due to inflow of underground water, and skill of the workers.

Although the present disclosure has been described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that a variety of modifications and variations may be made to the present disclosure without departing from the spirit or scope of the present disclosure defined in the appended claims, and their equivalents. 

1. A caisson structure for underground soil blocking comprising: a stereoscopic upper caisson body 10 separately manufactured on the ground for underground soil blocking; plural hydraulic cylinders 20 provided at the lower part of the upper caisson body 10; a lower propulsion caisson 30 to the upper side of which the cylinder road of the hydraulic cylinder 20 is combined to move up and down by a drive of the hydraulic cylinder 20; a tensioner 40 attached on the upper side of the upper caisson body 10 to tension an earth anchor 60 deposited in an underground rock layer with the maximum tension by a steel wire 70; and a controller 50 installed at the upper caisson body 10 to control the hydraulic cylinder 20 and the tensioner 40, wherein while the lower propulsion caisson 30 compresses the ground by the hydraulic cylinder 20, the ground is sunken and simultaneously the tensioner 40 draws the steel wire 70, so that the upper caisson body 10 and the lower propulsion caisson 30 are lowered up to a targeted point.
 2. The caisson structure for underground soil blocking of claim 1, wherein the upper caisson body 10 and the lower propulsion caisson 30 are manufactured by forming high-tenacity SFRC (Steel Fiber Reinforced Concrete) or high-tenacity FRC (Fiber Reinforced Concrete) after performing a dual bar arrangement of iron bars and steel wires therein.
 3. The caisson structure for underground soil blocking of claim 1, wherein a joint for coupling the upper caisson body 10 and the lower propulsion caisson 30 is provided at each of a lower part of the upper caisson body 10 and an upper part of the lower propulsion caisson 30, wherein a member for coupling is provided at the joint.
 4. The caisson structure for underground soil blocking of claim 3, wherein the hydraulic cylinder 20 is provided at the member for coupling, and the upper caisson body 10 and the lower propulsion caisson 30 are integrated to each other via the hydraulic cylinder
 20. 5. The caisson structure for underground soil blocking of claim 1, wherein a lower side of the lower propulsion caisson 30 is manufactured to become narrow as going from an outer surface to an inner surface.
 6. A noiseless, vibration-free construction method using an underground caisson structure for underground soil blocking, comprising: an earth anchor fixing step of vertically perforating the ground on which the caisson is located up to a rock supporting layer by using an earth anchor perforator and then inserting the earth anchor 60 to which the steel wire 70 is coupled into the perforated ground to fix the earth anchor 60 to the underground rock layer; a caisson manufacturing step of manufacturing the upper caisson body 10 and the lower propulsion caisson 30 separately from each other and then combining the upper caisson body 10 and the lower propulsion caisson 30 to each other through the hydraulic cylinder 20 to produce a robotized caisson structure; a structure lowering step of allowing the upper caisson body 10 and the lower propulsion caisson 30 to arrive at a targeted point, with the lower propulsion caisson 30 moving up and down by the hydraulic cylinder 20 to collapse the soil after the steel wire 70 is coupled with the tensioner 40 provided in the upper caisson body 10; after the structure lowering step, an integration step of dismantling the tensioner 40 provided in the upper caisson body and the hydraulic cylinder 20 connecting the upper caisson body 10 with the lower propulsion caisson 30 after the completion of internal digging of the caisson structure and integrating the upper caisson body 10 and the lower propulsion caisson 30 by welding; and after the integration step, a finishing step of filling the lower part of the caisson structure with concrete and then curing the concrete.
 7. The noiseless, vibration-free construction method of claim 6, further comprising: after the earth anchor fixing step, a hole formation step of forming plural holes that reach the construction depth of a place where the caisson structure is to be located by using an auger in order to reduce bearing force of soil and frictional resistance when the caisson structure moves downward.
 8. The noiseless, vibration-free construction method of claim 6, wherein the upper caisson body 10 and the lower propulsion caisson 30 are manufactured by forming high-tenacity SFRC (Steel Fiber Reinforced Concrete) or high-tenacity FRC (Fiber Reinforced Concrete) after performing a dual bar arrangement of iron bars and steel wires therein.
 9. The noiseless, vibration-free construction method of claim 6, wherein a joint for coupling the upper caisson body 10 and the lower propulsion caisson 30 is provided at each of a lower part of the upper caisson body 10 and an upper part of the lower propulsion caisson 30, wherein a member for coupling is provided at the joint.
 10. The noiseless, vibration-free construction method of claim 9, wherein the hydraulic cylinder 20 is provided at the member for coupling, and the upper caisson body 10 and the lower propulsion caisson 30 are integrated to each other via the hydraulic cylinder
 20. 